🌱 Change global var GetInstalledBundle to interface

[bentito]

Description

Follow on to the helm-poc changes:

We'd like to not have a global variable for GetInstalledBundle, but instead an easier to test interface.

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.21%. Comparing base (0058054) to head (93b05e0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #899 +/- ##
==========================================
- Coverage 77.21% 76.21% -1.01% 
==========================================
Files 17 17 Lines 1176 1177 +1 ==========================================
- Hits 908 897 -11 - Misses 189 202 +13 + Partials 79 78 -1 

Flag	Coverage Δ
e2e	58.19% <100.00%> (-1.67%)	⬇️
unit	58.02% <50.00%> (-0.51%)	⬇️

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